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Investments - Amortized Cost and Fair Value of Investments With Contractual Maturities (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Amortized Cost |  |
Due in one year or less | $ 130,132 |
Due after one year through five years | 733,539 |
Due after five years through ten years | 439,295 |
Due after ten years | 30,833 |
Perpetual maturity securities | 3,598 |
Amortized Cost | 1,337,397 | $ 1,162,919
Fair Value |  |
Due in one year or less | 128,433 |
Due after one year through five years | 714,587 |
Due after five years through ten years | 402,889 |
Due after ten years | 27,319 |
Perpetual maturity securities | 3,504 |
Fair Value | $ 1,276,732 | $ 1,064,330

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